| Olbia to Portage (Michigan) | 4,631.19 mi (7,453.19 km) |
| Olbia to Portage (Wisconsin) | 4,735.47 mi (7,621.00 km) |
| Olbia to Portales (New Mexico) | 5,721.95 mi (9,208.59 km) |
| Olbia to Porterville (California) | 6,198.49 mi (9,975.50 km) |
| Olbia to Portland (Maine) | 3,915.98 mi (6,302.16 km) |
| Olbia to Portland (Oregon) | 5,773.10 mi (9,290.90 km) |
| Olbia to Portland (Tennessee) | 4,900.63 mi (7,886.81 km) |
| Olbia to Portland (Texas) | 5,769.81 mi (9,285.61 km) |
| Olbia to Portsmouth (New Hampshire) | 3,958.48 mi (6,370.55 km) |
| Olbia to Portsmouth (Ohio) | 4,654.49 mi (7,490.68 km) |
| Olbia to Portsmouth (Virginia) | 4,430.27 mi (7,129.84 km) |
| Olbia to Post Falls (Idaho) | 5,491.26 mi (8,837.33 km) |
| Olbia to Potomac (Maryland) | 4,387.58 mi (7,061.13 km) |
| Olbia to Potomac Park (California) | 6,235.25 mi (10,034.66 km) |
| Olbia to Pottstown (Pennsylvania) | 4,272.39 mi (6,875.75 km) |
